Solution : https://service.sap.com/sap/support/notes/304605 (SAP Service marketplace login required)
Key words : 
additional key words delivery class, enter database table -> change, delivery class setting, standard area scc9, delivery class, standard area, client copy, functional areas, user groups, saved lists
Related Notes : 
       
| 69556 | CC-TOPIC: Missing tables and data | 
| 31496 | CC-INFO: Client deleted by mistake | 
| 24853 | CC-INFO: Client copy, functionality | 
| 22514 | CC-INFO: Error analysis for client copy |